Build WebRTC with data channel only.

webrtc/sdk/android/src/jni/peerconnection_jni.cc

 /*
  *  Copyright 2013 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 1335 matching lines @@
   WebRtcVideoEncoderFactory* encoder_factory = nullptr;
   WebRtcVideoDecoderFactory* decoder_factory = nullptr;
   rtc::NetworkMonitorFactory* network_monitor_factory = nullptr;
 
   PeerConnectionFactoryInterface::Options options;
   bool has_options = joptions != NULL;
   if (has_options) {
     options = ParseOptionsFromJava(jni, joptions);
   }
 
+#ifdef HAVE_MEDIA
   if (video_hw_acceleration_enabled) {
     encoder_factory = new MediaCodecVideoEncoderFactory();
     decoder_factory = new MediaCodecVideoDecoderFactory();
   }
+#endif
   // Do not create network_monitor_factory only if the options are
   // provided and disable_network_monitor therein is set to true.
   if (!(has_options && options.disable_network_monitor)) {
     network_monitor_factory = new AndroidNetworkMonitorFactory();
     rtc::NetworkMonitorFactory::SetFactory(network_monitor_factory);
   }
 
   rtc::scoped_refptr<PeerConnectionFactoryInterface> factory(
       webrtc::CreatePeerConnectionFactory(
           network_thread.get(), worker_thread.get(), signaling_thread.get(),
@@ skipping 164 matching lines @@
 
   jclass j_eglbase14_context_class =
       FindClass(jni, "org/webrtc/EglBase14$Context");
 
   MediaCodecVideoEncoderFactory* encoder_factory =
       static_cast<MediaCodecVideoEncoderFactory*>
           (owned_factory->encoder_factory());
   if (encoder_factory &&
       jni->IsInstanceOf(local_egl_context, j_eglbase14_context_class)) {
     LOG(LS_INFO) << "Set EGL context for HW encoding.";
+#ifdef HAVE_MEDIA
     encoder_factory->SetEGLContext(jni, local_egl_context);
+#endif

[pthatcher1, 2017/05/03 18:05:53]

Won't the encoder and decoder factories by null so you don't need to do this
(here and below)?

[Zhi Huang, 2017/05/04 01:08:03]

The idea here is trying to avoid linking the method SetEGLContext();

   }
 
   MediaCodecVideoDecoderFactory* decoder_factory =
       static_cast<MediaCodecVideoDecoderFactory*>
           (owned_factory->decoder_factory());
   if (decoder_factory) {
     LOG(LS_INFO) << "Set EGL context for HW decoding.";
+#ifdef HAVE_MEDIA
     decoder_factory->SetEGLContext(jni, remote_egl_context);
+#endif
   }
 }
 
 static PeerConnectionInterface::IceTransportsType
 JavaIceTransportsTypeToNativeType(JNIEnv* jni, jobject j_ice_transports_type) {
   std::string enum_name = GetJavaEnumName(
       jni, "org/webrtc/PeerConnection$IceTransportsType",
       j_ice_transports_type);
 
   if (enum_name == "ALL")
@@ skipping 1178 matching lines @@
   return reinterpret_cast<DtmfSenderInterface*>(j_dtmf_sender_pointer)
       ->inter_tone_gap();
 }
 
 JOW(void, DtmfSender_free)
 (JNIEnv* jni, jclass, jlong j_dtmf_sender_pointer) {
   reinterpret_cast<DtmfSenderInterface*>(j_dtmf_sender_pointer)->Release();
 }
 
 }  // namespace webrtc_jni